Pump.



G. M. STEVENSON..

PUMP.

APPLLUATION funn 13110.21, 1911.

1,057,986. Patented pr. 1, 1913.

4 SHEETS-SHEET 1.

] wue Wto@ 4 SHEETS-SHEET Z.

. Patented Apr. 1,1913.

3 woe nto@ PUMP.

C. M. STEVENSON.'

. v i APPLIUATION FILED DEO. 21, 1911A 1,057,986.

C. M. STEVENSON.

` PUMP.

APPLICATION FIKLED DEO. 21, 1911.

Patented Apr. 1,1913.

4 SHEETS-SHEET 3.

UNITED- STATES PATENT OFFICE.

CHARLES'MAXWELIi-STEVENSON, OF NEW BRIGHTON, NEWYORK, ASSIGNOR TO STEVENSON ENGINEERING COMPANY, A CORPORATION OF NEW YORK.'

PUMP.

specincation of Letters raient.

Patented Apr. 1,1913.

To all 'whom t may concern Be it known that I, CHARLES MAXWELL STEvENsoN, a subject of the King of Great Britain, anda resident of New Brighton, in t-he county of Richmond and State of New York, have invented certain new and use-V ful Improvements in Pumps, of which the following is`a. specification. l

This invention relates'to improvements in pumps.v f

Especially it. relates to that class Aof pumps, wherein the pumping pistons'both rotate and reciprocate;'the reciprocation of the pistons being derived from their rotary motion by the use of proper mechanism.

The present invention aims to produce a, pump of the aforesaid class, having a sirnple and durable construction, which will not l readily get out of order, will run for a long time without need o f repair; will give a high duty, and which is' so constructed Ieo that the various parts are readily accessible for renewal and repair.

. The invention therefore particularly relates to the following, among other features, of construction: The rotary drum which contains said pistons is 'ported to provide. a free radial inlet. and discharge of fluids, and the fluid ports and channels are so arranged as to balance-said drum. The mechanism for reciproca-ting the pistons is of such a character as to provide for free driv ing of the pistons, without binding or eX- cessive friction.v Thel lubrication of working parts is effective. Provision is made for readily assemblingy the several parts and forl rtaking them apart when desired.

Other advantages of -the invention, and the preferred form of parts embodying the several advantages, will be m'ade clear by the description hereinafter following.

Referring tothe drawings which accompany the specification, to aid the description, Figure 1 is a broken plan view on relatively small scale, showing, among other parts, the arrangement of the iiuid passages to effect thebalancing of the rotary drum. Fig. 2 is a longitudinal vertical-section, on lar er scale, of the pump on the plane ofthe line 2 2 of Fig. 1. Fig. 3 is a cross section and elevation on the pla-ne of the line 3 3 of Fig. .1, but on large scale. Fig. 4 'is a cross section and elevation on the plane of the line i4-4 of Fig. 1, but on large scale. Fig.- 5 ,is a sectional detail of the Iprovided lwith the. capped hollow boss 4 for said drum, ythe spider retainer, land cert-ain other parts. Fig. 6 is a detail, on small scale, indicating Yhow the two parts of said retainer are brought together. Fig. Z is a horizontal section and plan of the casing and the drum, the top of the casing being cutaway/'and the drum being indicated in plan. Fig. l8 is an end View of the said retainer showing the oil groove and connectinggroove. Fig. 9 is a broken sectional viewl of said universal joint. Fig. 10 is a cross sectional detail of a piston land other parts .of said universal joint. Fig. 11 is a perspective View of one partof said drum.

The apparatus constructed in its various parts of suitable materials, is constructed and arranged as follows: The stationary casing 1, suitably supported is provided with bolted heads 2, 3; said head 2 being the 'stem of the said spider retainer, and for lubricant,y and said head 3 being provided with a suitable st uiiing box 5, through which the main shaft 10 runs, and also provided with .a bracket 6, having suitable bushings, for properly a-lining said shaft 10. CSaid 'bracket 6 is provided with lubricating chambers 7, and on said shaft 10 is a loose ring8 v dipping into the lubricantand aiding-in lubricating said shaft 10. lA screw' plug 9 may' be provided for vdrawing off 'the lubricant.- -Said shaft 10 is itted intothe drum 16 with a conicalend, and is very rigidly secured to said drum by the.. aid of the lock nut 11 and key 19.l Said casing-1 is provided with main inlet and ldischarge connections as 12, 13 respectively (Fig. 3) which are respectively connected with diagonal suction and discharge passages cast on said casing 1, and respectively indicated by 14, 15. The arrangement of said diagonal passages l14 and 15 will be clearly understood by comparing Figs. 1, 2, y,3, 4 and 7 with eachother;` and the arrangement of said passages is such Vthat said rotary drum 16 is balanced and runswith great smoothness and the minimum of friction even at the'highest speeds, andthe said arrangement of said passages is an' important feature of my invention. Said casing 1 is also provided with diametrically opposite surfaces 20, 21, forming x seals separating the inlet and discharge l, passages from.each other. Fitted in said casing 1, with true running iit, is the rota drum -16 fixed to and driven/by said shag 1119.

10. Fonconvenience in assembling the parts of the machine, said drum' 16 is made in two parts, as clearly indicated in Fig. 5, the two parts being secured together by longitudinal bolts. Said drum 16 is chambered longitudinally for the pistons 25, and is also chambcred to admit the aforesaid retainer 'said drum (Figs. 5 and 11).

(See-Fig. 5.) The inner walls of said piston chambers are continuous except where said walls are perforated 'to permit the arms 24 of the spider 26 to pass through said Walls and engage and reciprocate said pistons 25, and said walls seal said pistons inwardly against leakage. Said pistons 25 may be of any desired number, and are preferably arranged concent-rically, and at uniform distances apart, around the axis of rotation, so' as to aid "in properly balancing said drum 16 when revolving at high speed. At the ends of said piston chambers, said drum 16 is cut away to form radial ports 18 for inlet and discharge of iuid from the Said radial ports are clearly shown in plan view in Fig.' 7, and are of material advantage in increasing the duty of the pump. The ends of the projecting parts of 'said drum have truev working fit with4 the heads of said casing 1. Any suitable provision may be made Vfor lubricating said drum 16 in said casing 1', and said drum may be rovided with water seals. In each of said piston chambers recip rocates pistons 25 with true working fit'.` To properly reciprocate said pistons, with a minimum of friction, and without binding, the following construction is employed: In a cylindrical transverse hole 22, of each said piston is` fitted, with true working fit, a through bored ring or plug 23, the borewhereof has nice working tit with the end of the arm 24, of a spider; the central ring part 26 of said spider having a nice workin fit in the inclined groove of theafore said spider retainer 35; and 'said" spider is provided with as many arms 24 as'there are pistons 25, one arm for eachpiston; each' of said pistons having'J lateral conical lbore 29 to admit of the entrance and working of its respective arm 24. The aforesaid construction provides an eiiicient universal joint between vthe said spider arms 24 andsaid pistons 25, whereby said istons fare reciprocated with a minimum o friction and without binding on said spider arms ir in said drum; and a universal joint4 in the means for reciprocating the pistons is animportant feature of the invention. Said retainer 35 is preferably vmade in twoy parts for convenience in assembling, (Fig. 5) said parts being securely fastened together by the bolt 34, and one part of said retap'ifer being provided'with a ,tongue 33 andthe other part being provided with a corresponding. groove 43, to position the two parts of said retainer accurately and rigidly together, (Fig. 6);

groove 36.

land the parts of said retainer may also be provided with dowels. Each half ot-said retainer 35 is providedv with part of a groove ,and with part of abearing or hub, and when the halves of said retainer 35 are secured together, there is formed a complete groove 36 for the spider ring 26 and a coinplete central hub or bearing 32 on which said spider revolvesas an axis. The ring 26 of said spider is fitted accurately in said Said retainer 35 is provided with a bearing 37, which has a nice working fit in the part 16a of said drum 16. Said retainer 35 is also provided with the stem 3.8, which enters and is fixed stationary in said boss 40jf head 2, so that said retainer 35 remains stationary while said drum 1.6 revolves. Said boss 4 is provided with a space for lubricant, and said retainer 35 and its parts are provided with lubricating channels 39, 40, 41 for delivering the lubricant into said groove 36. Said spider arms 24 are also provided with lubricating passages 42, and thus lubricant is supplied to .the variousl working parts of the mechanism which drive said pistons 16 and to said pistons.

The operation is as follows: Assuming the drum 16 to be driven by any suitable prime mover, as an electrical motor, and in the direction indicated by the arrows. in Figs. 3 and 4, and that the pump suction is connected with a source of Huid supply, its discharge being connected with any suitable dischargeA pipe, then connect-ion 12 Fig. 3) *will be the inlet, and connection 13, Figs. 3 and 4) will be the discharge. Now, since said retainer 35 is stationary, but said drum 16 revolves and carries pistons around the axis of revolution along with said drum, .and since the retainer groove 36 is inclined to the longitudinal axis of the said drum 16, it follows that said pistons 25 each acquirel a reciprocatingV motion in their respective I chambers in said drum 16,"wliereby, at an)T instant, each-.of said pistons is sucking fluid into one end ot said drum, .and is discharging Atiuid previously sucked in from the opand there are also discharge ports or passages -at op osite` ends andA sides of said drum 16, and there results an excellent balance of said drum even at very high speeds,

whereby very smooth silent running of the pump and minimum of friction are induced. The said retainer groove and the said seals 20, 21 of said casing 1 are so arranged that said seals are in line with the said pistons when at their positions'of restthat is, at

the positions where their longitudinal motion in one direction has just ceased, and their longitudinal motion in the other direction is just about: beginning. For further explanation, assuming that the lower piston in Fig. 2 has been moving to the right and is near the end of its stroke, then iuid will have been sucked into the lower left-hand end of the drum 1 6. At the same time, the upper piston will have been moving to the left and will be near the end of its stroke and' fluid will have been also sucked in at the upper right end of said drum. But, as aforesaid, there is a diagonal suction passage 14 around said casing connecting with respective chambers at the lower left, and .the upper right ends of said drum 16. Simultaneously, said .lower and upper pistons will have been respectively discharging uid from the lower right and the upper left end of said drum, and these ends are connected by the diagonal discharge channel 15. Thus there is continual suction and continual discharge from the respectivesuction and discharge mains.

It will be understood from the foregoing' description that the pump is double-acting, ut1l1zing both ends of the plungers simultaneously, and producing as hereinbefore stated a perfect balance; that said pump is so constructed and arranged that all working parts are protected from contact with the water or other fluid operated on by said pump; and that the lubricant can be supplied und'er pressure by screwing the cap on to the said boss 4f to the proper degree to produce any desired compression. On pumps of great capacity a force feed lubricating pump can be employed to supply the lubricant. The pump is also so constructed that the several suction and the several discharge ports are respectively so far independent of each other, that, as will be evident, by connecting said several suction ports with separate supply pipes for different fluids, and by connecting said several discharge ports with different discharge pipes, which may either deliver into the same main discharge or into a common receptacle, the pump can be employed for mixing different fluids.

1. In a pump of the kind described, the

combination of a rotary drum provided Withl a plurality of longitudinal cylinders having radial ports at the extremities of said drum, continuous reciprocating pistons in each of said cylinders, a stationary case 'Within which said drum revolves with substantially Water-tight working fit, and said case being provided with end peripheral ports at the extremities of said case adapted to register with said radial ports, and also provided with sealing surfaces between said peripheral ports, and rotary means in said stationary case operatively connected with said pistons to reciprocate the same, substantially as described.

2. In a pump of the kind described', the combination of a rotary drum provided with a plurality of longitudinal continuous cylinders having radial ports, reciprocating pistons in each of said cylinders, a stationary` case within which said drum revolves with substantially Water-tight working fit and provided with' diagonally arranged end peripheral suction and discharge ports at opposite extremities of said case of such dimensions that each of said'ports registers simultaneously with a plurality of said radial ports, spiralchannels on the said case connecting pairs of diagonally opposite suction and diagonally opposite discharge ports together, heads on said case forming outer Walls of said radial ports, and rotary means in said case operatively connected with each of said pistons to reciprocate the same, substantially as described.

3. The combination*l in a pump, of a rotary drum provided with suction and discharge cylinders having internal sealing walls, reciprocating pistons in said cylinders, a stationary Acase for said drum, a stationary retainer and rotary operative connections between said retainer and said pistons, and said casing, said retainer and said drum being provided with surfaces adapted tosepa-- rate the suction and discharge passages, substantially as described.

Signed at New York city, in the county of New York, and State of New York this 20th day of December, A. D. 1911.

CHARLES MAXWELL STEVENSON.

Witnesses:

- VALTER N. HARRIS,

Gr. W. HOPKINS. 

